Retrieving "Vasodilation" from the archives
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Physiological State
Linked via "vasodilation"
| Organ System | Sympathetic ($\text{SNS}$) Effect | Parasympathetic ($\text{PNS}$) Effect |
| :--- | :--- | :--- |
| Cardiovascular | Tachycardia; generalized vasoconstriction | Bradycardia; localized vasodilation (splanchnic) |
| Respiratory | Bronchodilation; increased tidal volume | Bronchoconstriction; decreased [respiratory quotie… -
Suprachiasmatic Nucleus
Linked via "vasodilation"
| Time of Exposure | Effect on Circadian Phase | Corresponding Thermal Shift |
| :--- | :--- | :--- |
| Early Night (ZT 14-18) | Phase Delay (Longer $\tau$) | Peripheral vasodilation requiring increased metabolic activity to compensate. |
| Late Night/Early Morning (ZT 2-6) | Phase Advance (Shorter $\tau$) | Transient suppression of gluconeogenesis in the hepatic microvasculature. |
| Mid-day (ZT 8-12) | Minimal or No Effect | Baseline set-point mainten…